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Thread: Weird grinder/extraction problem

  1. #1
    Junior Member
    Join Date
    Jun 2016

    Weird grinder/extraction problem

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all,

    I seem to have a strange issue with this particular bean, but also I have seen the same issue occurring with my grinder before, but these 2 weeks its getting weird. The numbers below are the number of shots that I pulled in succession. I pulled at least 2-3 times on the same grind settings to ensure that the flow rate is not due to technique issue

    grinder = Baratza preciso
    machine = Expobar Leva (brew 10-11 bars, recommeded by the vendor not to adjust)
    Beans = Single origin espresso roast
    20 grams in, 40 grams out

    1-3: 1D, 29s
    4-5: 1B, 25s
    6-7: first crack, 21s
    8-9: (back to) 1D, 18s!!! (8 bars)
    10: (try going very fine) 0I, 18s!!

    To explain above, I pulled the first 3 shots at grind setting of 1D at 29s. I then set a finer grind at 1B, pulled 2 shots, but the timing was 25s instead!. Then I went coarser one notch to first crack and it was 21s. When I went back to the original settings at 1D on the 8th pull, it was now timing at 18s instead and the brew pressure dropped to 8 bars. The last try was to go really fine but the timing is 18s instead, probably channeling because I ran out of beans by then.

    Anyone seen such results before? Any advise?

  2. #2
    Member nathanharley's Avatar
    Join Date
    May 2015
    Out of curiosity, do you do a purge after each grinder adjustment? Or are you single dosing the hopper on the grinder?


  3. #3
    Junior Member
    Join Date
    Jun 2016
    I use a single dose but also put some beans in to purge everytime I make an adjustment. Also if you noticed, I pull shots at least two times for each grind size. If the flow is due to left over grinds, then the timing of the first and second shot would be very different, but no, they are both the same each time.

  4. #4
    Senior Member
    Join Date
    Jan 2014
    Discovery Bay, HK
    Behmor Brazen - $249 - Free Freight
    Particular bean? Can you elaborate? Perhaps the issue is in the roast level of a specific origin.

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